Ink-content-indicating fountain-pen



R. DE CHEVARRIA. :NK coNTENT INDICATING FOUNTAIN PEN.

yAPPLICATION FILED MAR- 30| i920.

Patented Mar. 22, 1921.

UNITED I s'rmlazs RAMN DE ECHEVARIA, 0F SANTA CRUZ, PHILIPPINE ISLANDS.

INK-CONTENT-INDIGATING FOUNTAIN-PEN.

Specification of .Letters Patent.

Patented Mar. 22, 1921.

Application filed.l March 30, 1920. Serial No. 369,896.

To all lw hom it may oon-cera Be it known that I, RAMN DE ECHE- vARRIA,al subject ofthe King of Spain, residing at Santa Cruz, Tagulaya, Davas,Philippine Islands, have invented new and useful Improvements inInkContent-Indi eating Fountain-Pens, of which the following is aspecification.

It has frequently happened to thev many users of fountain pens that atthe time when the pen is needed in`an emergency, it is dry or devoid ofink. Therefore, one object of my invention is the provision of afountain pen embodying means for apprising the owner thereof of thequantity of ink in the pen, so that when the ink supply is almostdepleted, it may be replenished with a view to averting the experienceindicated.

Another object of the invention is to so construct and arrange theindicating means in the pen body that it does not materially reduce theink-carrying capacity of the pen or render the same cumbersome orunsightly.

To the attainment of the4 foregoing. the invention consists in theink-content indicating fountain pen hereinafter described and definitelyclaimed.

In the accompanying drawings, hereby made a part hereof:

Figure l is an elevation of a fountain pen constructed in accordancewith my invention.

Fig. 2 is a diametrical section taken in a plane at right angles to Fig.1.

Fig. 3 is a transverse section taken in the plane indicated by the line3-3 of Fig. 2.

Fig. 4: is a view, partly in elevation and partly in section. of thepen.

Fig. 5 is a transverse section on line 5 5 of Fig. 4. i

Similar numerals designate corresponding parts in Figs. l to 3 to whichreference will rst be had.

In accordance with my invention the tubular body l of the fountain penis provided in its wall 3, with a longitudinal groove 2. which groove 2is provided with open ends 4. but is otherwise imperforate. Carried inthe wall 3 and sealed at its ends thereto is an indicating tube 5, oftransparent material. preferably of glass, and provided by preferencewith a white back portion 6, so as to increase the contrast between thetube and the ink therein and thereby indicate the height of the ink inthe tube. The saidtransparent tube is exposed practically throughout itslength by the slot 2, and the ends of'the tube are in communication withthe interior of the body l. From this its follows that the ink will seekits level in the tube 5, Fig. 2, and will thereby at all times apprisethe user of the pen of the quantity of ink therein contained. When theink in the tubular body 1 falls below the lower end of the tube 5. theuser of the pen will be made aware of the fact that it is incumbent uponhim to replenish the supply of ink in the pen if he desires to avert thelikelihood of the pen becoming dry at an inopportune time.

As shown in Figs. L and 5. my novel indicator is susceptible ofembodiment in the so-called self-filling pen; the connection of the tube5u in this arrangement being with the compressible rubber reservoir 10for ink in the interior of the body of the fountain pen, and the body lbeing apertured at 11 to permit of the manual compressing 0f thereservoir incident to the {illing of the reservoir with ink according tothe ordinary, well known practice.

The tube 5a has a flange 5e disposed within the reservoir 10 as shown.

Having described my invention, whatV I claim and desire to secure byLetters-Patent. is:

1. A fountain pen having a tubular body and a longitudinal groove in theouter side of the walll thereof. and a longitudinal transparent tubecarried in the groove and sealed at its ends thereto and having its endsopen and in communication with the ink containing portion of the pen.

2. A fountain pen having a tubular body and a longitudinal groove in theouter side of the wall thereof and also having apertures connecting theends of the groove with the interior of the body. a compressible inkreservoir within the body and a. longitudinal transparent tube carriedin the groove and sealed at its ends thereto and having its ends incommunication with the interior of the compressible reservoir.

In testimony whereof I aHiX my signature.

